The verdict in three sentences
Between an e-commerce store, a business app and an ERP that ignore each other, a mid-market firm re-keys every order, every stock level and every invoice by hand. An iPaaS platform costs 500 to 2,500 EUR/month, a custom connector between 12,000 and 45,000 EUR per flow, with real-time sync in 6 to 14 weeks. The result: -90% re-keying, 99.9% reliability and compliant e-invoicing.
iPaaS or custom connector: what you actually buy
An iPaaS (subscription middleware) is quick to launch but rents you the connection: the cost runs as long as the flow lives, and complex business cases hit the limits of standard connectors. Custom is an asset: a one-off cost, logic tuned exactly to your rules, and control of the code.
| Criterion | iPaaS (subscription) | Custom connector |
|---|---|---|
| Entry cost | 2,000 to 8,000 EUR (setup) | 12,000 to 45,000 EUR/flow |
| Recurring cost | 500 to 2,500 EUR/month | Maintenance 15%/year |
| Setup time | 3 to 8 weeks | 6 to 14 weeks |
| Complex business cases | Limited | Fully custom |
| Logic ownership | No | Yes |
| 4-year cost (2 flows) | 50,000 to 130,000 EUR | 45,000 to 110,000 EUR |
With two critical flows (orders and invoices), custom becomes competitive by the third year while removing dependency on the iPaaS vendor.
The building blocks of a 2026 ERP integration
A robust integration is more than a connector: it needs a middleware layer, error handling and monitoring. Here are the typical line items.
| Line item | 2026 range (EUR) | Timeline |
|---|---|---|
| Connector per flow (stock, order, invoice) | 12,000 to 45,000 | 4 to 10 weeks |
| Middleware / API gateway | 15,000 to 40,000 | 4 to 8 weeks |
| Mapping and business rules | 6,000 to 18,000 | 2 to 4 weeks |
| Monitoring and alerting | 4,000 to 12,000 | 1 to 3 weeks |
| Testing and go-live | 5,000 to 15,000 | 2 to 4 weeks |
| Annual maintenance | 15%/year of build | Ongoing |
Priority flows in 2026: real-time sync of stock, orders and invoices, and compliance with e-invoicing (structured formats, approved platforms). A well-designed architecture holds 99.9% reliability with automatic error recovery.
Mini case study
Sophie is CIO of a mid-market distributor: 60,000 order lines/year re-keyed between the B2B e-commerce store and SAP, at roughly 2 minutes/line on the sales admin side. That is ~2,000 hours/year, the equivalent of 1.2 FTE at ~55,000 EUR loaded.
She funds two custom connectors (orders + invoices) for 58,000 EUR and 8,700 EUR/year of maintenance. Re-keying drops 90%: a saving of ~49,000 EUR/year, not counting avoided credit notes and disputes. The integration pays for itself in ~15 months, and e-invoicing compliance is secured for upcoming deadlines.
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FAQ
How much does a custom ERP connector cost in 2026?
Between 12,000 and 45,000 EUR per flow (stock, order or invoice) depending on business-rule complexity. A middleware or API gateway adds 15,000 to 40,000 EUR when several flows transit.
iPaaS or custom: which should I pick?
iPaaS suits a fast start or standard flows at 500-2,500 EUR/month. As soon as rules are specific or 2-3 flows run continuously, custom becomes cheaper and makes you the owner of the logic.
How long to connect my ERP?
Budget 6 to 14 weeks depending on the number of flows, the state of the SAP/Sage/Dynamics APIs and test-data availability. Go-live happens flow by flow, no big bang.
What concrete gain on re-keying?
Up to -90% manual entry and 99.9% reliability. On volumes of tens of thousands of lines/year, this often frees more than one FTE on the sales admin side.
Does the integration cover e-invoicing?
Yes: we integrate structured formats and approved platforms so your invoices meet 2026 deadlines, with archiving and audit trails.
Let's scope your project. Tell us your systems (ERP, e-commerce, business app), the flows to sync and your volumes: we price connectors and middleware. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
